Journal
JOURNAL OF OCCUPATIONAL HEALTH
Volume 57, Issue 2, Pages 189-192Publisher
JAPAN SOC OCCUPATIONAL HEALTH
DOI: 10.1539/joh.14-0123-BR
Keywords
Hamsters; Indium; Indium-tin oxide; Intratracheal instillation; Lung clearance; Tissue indium concentration
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [24108009, 23390164, 23249033]
- New Energy and Industrial Technology Development Organization (NEDO) Incorporated Administrative Agency under the Ministry of Economy, Trade and Industry (METI)
- Grants-in-Aid for Scientific Research [23249033, 25460806, 23390164, 24108009] Funding Source: KAKEN
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Objectives: The aim of this study was to analyze the tissue distribution of indium after intratracheally instilling indium-tin oxide (ITO) into the lungs of hamsters. Methods: Male Syrian hamsters received an intratracheal dose of 3 mg/kg or 6 mg/kg of ITO particles containing 2.2 mg/kg or 4.5 mg/kg of indium, twice weekly for 8 weeks. In parallel, control hamsters received only an intratracheal dose of distilled water. A subset of hamsters was euthanized periodically throughout the study from 8 up to 78 weeks after the final instillation. The distribution of indium in the lungs, liver, kidneys and spleen, as well as pathological changes in the liver, kidneys, and spleen, was determined. Results: The contents of indium in the lungs in the two ITO groups gradually decreased over the 78-week observation period, with elimination half-lives of approximately 142 weeks for the 3 mg/kg ITO group and 124 weeks for the 6 mg/kg ITO. The indium concentrations in the liver, kidneys, and spleen gradually increased throughout the observation period. Although foci of the lesions were observed histopathologically in the extrapulmonary organs among the two ITO groups, the control group showed similar lesions. Conclusions: The results clearly demonstrate that the clearance of indium from the body is extremely slow after intratracheal instillation in hamsters.
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